Some 35,000 years ago, our ancestors learned that heating clay to high temperatures allowed it to harden substantially. Many years later, using this earlier knowledge, our ancestors invented pottery. Pottery is classified as a:​

A) ​primary invention
B) ​secondary innovation
C) ​primary application
D) ​tertiary modification

Pottery

The craft or profession of making objects from clay, fired at high temperatures to create bowls, vases, and other artifacts.

Primary Invention

The original creation of a new process, method, or device that significantly alters how people live or interact with their environment.

Secondary Innovation

The deliberate application or modification of an existing idea, method, or device.